MATLAB: How to create an array

array

How to create an array

A = [0 0 0 0; 1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4]

using the command "for" or other?

Best Answer

Use the repmat function:

A = repmat(0:4, 4, 1)';
A =
     0     0     0     0
     1     1     1     1
     2     2     2     2
     3     3     3     3
     4     4     4     4

Related Solutions

MATLAB: Can’t I multiply two arrays using the ‘*’ operator

Because the dot operator does element-wise multiplication (and division and exponentiation). These are termed array operations in MATLAB.

If you do not use the dot operator, you are using standard linear algebra matrix operations, and those require that you follow the rules for array operations from linear algebra.

array1 = [1,2,3];
array2 = [4,5,6];
Result1 = array1' * array2;         % 3x3 Matrix (Matrix Multiplication)
Result2 = array1 * array2';         % Scalar (Dot Product)
Result3 = array1 .* array2;         % 1x3 (Element-Wise Multiplication)

See the documentation on Array vs. Matrix Operations (link) for details.

MATLAB: How can enlarge a matrix

If you have MATLAB R2015a (or more recent) then you can use repelem.

Otherwise you could try this FEX submission:

http://de.mathworks.com/matlabcentral/fileexchange/24536-expand

Or else you have to calculate it yourself, the easiest way is to use kron:

>> m = [1,2;3,4];
>> n = 5;
>> kron(m,ones(n))
ans =
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     1     1     1     1     1     2     2     2     2     2
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4
     3     3     3     3     3     4     4     4     4     4

Best Answer

Related Solutions

MATLAB: Can’t I multiply two arrays using the ‘*’ operator

MATLAB: How can enlarge a matrix

Related Question